I've upgraded from .5's to 1.5's to 2.3's, and listened extensively to 2.4's and 3.6's, and spent about an hour with 7.2's so far... The one thing I can tell you is this: with Thiel, you get what you pay for. The 7.2 is as better a speaker as one would expect for the given price difference than the 2.3, for instance. As you go up the line, the performance and price increase proportionately. With that as a given, it really becomes about what you personally need in terms of your listening habits; if you do jazz and light classical, the 2.3's will serve as well as the 6's or 7.2's -- but if you want to be sitting front row at a Kunzel/Cinci Pops performance, you'll need 6's or 7.2's and a LOT of power! As always, see if you can find a dealer who'll let you live with your choice for a couple of weeks and see what makes you happiest.
